Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2011
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Estimated effective income tax rate	34.00%
U.S. Federal statutory rate	35.00%
Income Tax Uncertainties [Abstract]
Gross unrecognized tax benefits	$ 28.8
Gross urecognized tax benefits, if recognized, would affect effective tax rate	19.8
Gross interest and penatlites accrued	3.5
Possible reduction in unrecognized tax benefits, lower bound	(1.0)
Possible reduction in unrecognized tax benefits, upper bound	(3.0)
Components of Deferred Tax Assets [Abstract]
Deferred tax assets before valuation allowance	63.3
Valuation allowance	$ (8.5)